APIs, machine-readable context, an MCP server, and the conventions agents need to build on October safely.
The October OpenAPI 3.1 specification describes the public REST surface with typed error responses. The October Themes API returns curated design-system themes with no auth. The October API catalog lists every machine-readable resource.
The October MCP server speaks the Model Context Protocol over Streamable
HTTP at https://october.dev/mcp, exposing the Themes API as callable tools. Its
server card carries install and tool metadata.
Start with /llms.txt or the expanded /llms-full.txt; product docs for people are at /docs.
The API is versioned via the OpenAPI info.version field and an optional
October-Version request header; retiring endpoints return Deprecation and Sunset
headers. Endpoints return RateLimit-Limit, RateLimit-Remaining, and RateLimit-Reset headers
plus Retry-After on 429, and errors use RFC 9457 problem+json with a machine-readable code.
Then download October or contact us.